from django.contrib.auth.backends import ModelBackend
import re

from users.models import User


class MyAuthenticateBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        try:
            # 1.判断是username还是手机号登陆
            if re.match(r'^1[3-9]\d{9}$', username):
                user = User.objects.get(mobile=username)
            else:
                user = User.objects.get(username=username)
        except User.DoesNotExist:
            return None

        return user
